JP6561693B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine having a winding on a rotor.

  The rotating electric machine is mounted as a power source in various devices. For example, in the case of a vehicle, the rotating electric machine is mounted alone and functions as a power source of an electric vehicle, or mounted together with an internal combustion engine as a power source of a hybrid vehicle. Function.

  In particular, in the case of a hybrid vehicle, it may be incorporated into a system that is used for power generation and drive in combination with an internal combustion engine via a planetary gear. In this case, there has been a problem that since the internal combustion engine, the power generation motor, and the drive motor are each incorporated in the system together with the planetary gear, the size is increased and it is difficult to mount on a small vehicle.

  On the other hand, the rotating electrical machine described in Patent Literature 1 is devised to have a combined function so that it can function as a power generation motor, a drive motor, and a planetary gear (gear). .

  For example, as shown in FIG. 9, the rotating electrical machine M described in Patent Document 1 includes a stator S having a 6-pole armature coil C (number of pole pairs A) and a 10-pole pair permanent magnet PM. Rotor R1 (the number of pole pairs P) and a second rotor R2 (number of poles H (A + P)) having a 16-pole magnetic conduction path MP. The rotating electrical machine M uses the magnetic modulation principle to cause the three elements of the stator S, the first rotor R1, and the second rotor R2 to function in the same manner as the sun gear, ring gear, and carrier in the planetary gear. It is a magnetic modulation type biaxial motor that can be used.

JP 2013-188065 A

  However, in the rotating electrical machine M described in Patent Document 1, a high output can be obtained by increasing the torque density as in an IPM motor (Interior Permanent Magnet Motor) in which the magnetic force of the permanent magnet can be used as it is as the magnet torque. In order to compensate for the torque, it is necessary to use an expensive permanent magnet having a large residual magnetic flux density.

  Further, in the structure of the rotating electric machine M, since the fluctuation of the magnetic flux linked to the permanent magnet is large, the coercive force is large and the demagnetization due to heat is small, for example, Dy (dysprosium) or Tb (terbium). It is necessary to employ an expensive permanent magnet to which an expensive rare earth is added, for example, an Nd—Fe—B magnet (neodymium magnet).

  In response to such a problem, the applicant of the present application is a rotating electrical machine that generates a magnetic force by an electromagnet by converting an asynchronous magnetic flux fluctuation (a magnetic flux fluctuation of a difference frequency between a stator rotating magnetic field and a rotor rotating speed), which has been a problem in the past. is suggesting.

  This rotating electric machine has a rotor winding on the rotor that converts an asynchronous magnetic flux interlinked with the rotor into an induced electromotive force under the condition that the stator rotating magnetic field and the rotor rotate asynchronously. The generated induced electromotive force is rectified by a diode of a rectifier circuit mounted on the rotor, and the rectified current flows through the rotor windings to be self-excited, and a magnetic force is generated by the electromagnet.

  However, depending on the configuration of the rectifier circuit that converts the induced electromotive force converted from the asynchronous magnetic flux linked to the rotor into the field current, torque ripple may occur or the induced electromotive force cannot be used efficiently as the field current. Or

  Therefore, an object of the present invention is to provide a rotating electrical machine that can smooth torque ripple.

One aspect of the invention of a rotating electrical machine that solves the above problems is a rotating electrical machine that includes a stator having an armature coil that generates a magnetic flux when energized, and a rotor that rotates by the passage of the magnetic flux. The coil is formed by concentrated winding, and the rotor has a plurality of salient pole portions arranged in parallel in the circumferential direction around which the rotor winding for inducing an induced current by interlinking of magnetic flux generated in the armature coil, and a rectifier circuit for rectifying the induced current into direct current, the rotor windings are wound to the polarity of the magnetic poles of adjacent salient pole portions are different, the rectifier circuit, the polarity of the magnetic poles are identical salient poles in shall closed circuit current phase of the induced current of the plurality of rotor windings wound around the section and the rectifying element and a plurality of rotor windings of the same phase are connected in series provided with a plurality of each polarity of the magnetic pole is there.

  Thus, according to one embodiment of the present invention, torque ripple can be smoothed.

FIG. 1 is a view showing a rotating electrical machine according to the first embodiment of the present invention, and is a cross-sectional view orthogonal to a rotation axis showing a 1/2 model of the schematic configuration. FIG. 2 is a diagram illustrating the rotating electrical machine according to the first embodiment of the present invention, which is a model for explaining the schematic overall configuration of the rotating electrical machine, and is a conceptual cross-sectional view parallel to the rotation axis. FIG. 3 is a diagram illustrating the rotating electrical machine according to the first embodiment of the present invention, and is a diagram illustrating a harmonic analysis result of the gap magnetic flux density between the inner rotor and the outer rotor. FIG. 4 is a diagram showing the rotating electrical machine according to the first embodiment of the present invention, and is a cross-sectional view orthogonal to the rotation axis showing the schematic configuration of the inner rotor. FIG. 5 is a diagram illustrating the rotating electrical machine according to the first embodiment of the present invention, and is a connection diagram illustrating a connection closed circuit of a diode installed in the inner rotor. FIG. 6 is a view showing a rotating electrical machine according to the second embodiment of the present invention, and is a cross-sectional view perpendicular to the rotation axis showing a 1/2 model of the schematic configuration. FIG. 7 is a diagram showing a rotating electrical machine according to the second embodiment of the present invention, and is a connection diagram showing a connection closed circuit of a diode installed in the inner rotor. FIG. 8 is a view showing a rotating electrical machine according to the second embodiment of the present invention, and is a view showing a magnetic circuit of asynchronous magnetic flux linked to the inner rotor. FIG. 9 is a view showing a magnetic modulation biaxial rotating electrical machine having a different structure compared to the present embodiment, and is a cross-sectional view perpendicular to the rotating shaft showing the general overall configuration.

Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described in detail with reference to the drawings.
(First embodiment)
1 and 2, the rotating electrical machine 1 according to the first embodiment of the present invention is configured as a double rotor type rotating electrical machine, and has a stator 100 formed in a cylindrical shape and freely rotatable in the stator 100. And an outer rotor 200 that is fixed to an outer rotating shaft (also simply referred to as a rotating shaft) 210 that coincides with the rotating shaft 1C, and is rotatably housed in the outer rotor (second rotor) 200. And an inner rotor (first rotor) 300 to which an inner rotating shaft (also simply referred to as a rotating shaft) 310 is fixed. The outer rotor 200 and the inner rotor 300 are supported so as to be relatively rotatable about the rotation shaft 1C as a rotation center. FIG. 1 is a radial sectional view of 180 degrees (1/2) of the mechanical angle of 360 degrees. The inner rotor 300 constitutes a rotor in the present invention.

  The stator 100 includes a stator core 101, and a plurality of stator teeth 102 extending in the radial direction toward the axis are arranged in parallel in the circumferential direction. The stator teeth 102 are formed so as to face the outer peripheral surface 201a of a magnetic path member 201 of the outer rotor 200, which will be described later, with the inner peripheral surface 102a facing the air gap G1.

  In this stator 100, armature coils 104 corresponding to the W-phase, V-phase, and U-phase of three-phase alternating current are housed with the slot 103 between the side surfaces 102b of the stator teeth 102. The armature coil 104 is wound around the stator teeth 102 by concentrated winding. The armature coil 104 generates a magnetic flux when energized.

  When the three-phase alternating current is supplied to the armature coil 104, the stator 100 generates a rotating magnetic field that rotates in the circumferential direction, and links the generated magnetic flux to the outer rotor 200 and the inner rotor 300, thereby the outer rotor 200 and Each of the inner rotors 300 is driven to rotate.

  The outer rotor 200 includes a magnetic path member 201 made of a soft magnetic material such as steel having a high magnetic permeability, and a nonmagnetic member 202 made of a nonmagnetic material that does not pass magnetic flux such as PPS (polyphenylene sulfide) resin. The magnetic path member 201 and the nonmagnetic member 202 are extended in the axial direction. The axial direction indicates the same direction as the direction in which the rotating shaft 1C extends.

  The magnetic path member 201 and the nonmagnetic member 202 are formed in, for example, a disk-shaped large-diameter portion 205 located on one end side in the axial direction of the outer rotor 200 and a concentric cylindrical shape located on the other end side in the axial direction. Both ends of the cylinder shaft 206 are connected and supported.

  The magnetic path member 201 has a pole piece portion 201A that faces the nonmagnetic member 202 in the circumferential direction, and a bridge portion 201B that connects adjacent pole piece portions 201A on the stator side and the inner rotor side of the nonmagnetic member 202.

  The pole piece portion 201A and the bridge portion 201B are integrally formed. Therefore, the magnetic path member 201 is configured as an integral core in which the pole piece portion 201A and the bridge portion 201B are integrally formed. The magnetic path member 201 configured as an integral core is formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  The nonmagnetic member 202 is provided in a space surrounded by the pole piece portion 201A and the bridge portion 201B. Therefore, in the outer rotor 200 of the present embodiment, the soft magnetic pole piece portions 201A and the nonmagnetic members 202 are alternately arranged in the circumferential direction.

  In the outer rotor 200, the outer peripheral surface 201a and the inner peripheral surface 201b of the magnetic path member 201 face the inner peripheral surface 102a of the stator teeth 102 of the stator 100 and the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300 described later. It is formed as follows.

  In the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 passes through the pole piece portion 201 </ b> A of the magnetic path member 201 efficiently, while the nonmagnetic member 202 prevents the magnetic flux from passing therethrough. After passing through the pole piece portion 201A of the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 is interlinked with the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300, as will be described later. A magnetic circuit returning to the stator 100 is formed by passing through the pole piece portion 201 </ b> A of the outer rotor 200.

  As the outer rotor 200 rotates in this manner, the number and frequency of the rotating magnetic field generated by the armature coil 104 can be changed. Torque is generated by the synchronous rotation of the modulated rotating magnetic field and the inner rotor 300.

  The inner rotor 300 includes a rotor core 301 in which a plurality of electromagnetic steel plates are laminated in the axial direction. In the rotor core 301, a plurality of rotor teeth (saliency pole portions) 302 extending in the radial direction separated from the shaft center are arranged in parallel in the circumferential direction. The rotor teeth 302 are formed so that the outer peripheral surface 302a faces the inner peripheral surface 201b of the magnetic path member 201 of the outer rotor 200 via the air gap G2.

  The rotor teeth 302 are wound with a rotor winding 330 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302.

  The rotor windings 330 are formed so as to form concentrated windings in which the adjacent windings are opposite to each other in the circumferential direction of the inner rotor 300 for each rotor tooth 302, and are arranged in the circumferential direction of the inner rotor 300. The rotor winding 330 generates (induces) an induced current by interlinking magnetic fluxes and is excited by supplying the generated induced current as a field current to cause the rotor teeth 302 to function as an electromagnet.

  The rotor winding 330 is wired so that the polarities of the magnetic poles of the adjacent rotor teeth 302 in the circumferential direction of the inner rotor 300 are different.

  Here, the eight rotor windings 330 corresponding to the mechanical angle of 180 degrees in FIG. 1 are distinguished from the rotor windings 330-1 to 330-8 in the rotational direction (counterclockwise direction).

  In such a rotating electrical machine 1, the magnetomotive force of the stator 100 is modulated by the outer rotor 200, and the modulated magnetic flux and the inner rotor 300 are driven by synchronous rotation. On the other hand, there is an asynchronous magnetic flux interlinking with the inner rotor 300 without the magnetomotive force of the stator 100 being modulated.

  FIG. 3 shows the harmonic analysis result of the gap magnetic flux density between the inner rotor 300 and the outer rotor 200. The pole combination is a case where the stator 100 is a 4-pole pair, the outer rotor 200 is a 12-pole, and the inner rotor 300 is an 8-pole pair, and the inner rotor 300 is a result of a solid rotor (a rotor having no magnetic resistance pulsation).

  As shown in FIG. 3, the fourth-order magnetic flux by the stator 100 is modulated by the outer rotor 200, and it can be seen that there are the eighth-order gap magnetic flux of the lower-order term and the 16th-order gap magnetic flux of the higher-order term. It can also be seen that a fourth-order magnetic flux is also present due to the permeance DC superposition term by the outer rotor 200.

  The spatial order of the non-modulated asynchronous magnetic flux is the number of pole pairs of the stator. In the case of the analysis example, a spatial fourth-order magnetic flux is linked to the inner rotor 300 (when the mechanical angle of 360 ° is the primary).

  FIG. 4 is a radial sectional view of the inner rotor 300 at a mechanical angle of 360 degrees. Here, the 16 rotor windings 330 corresponding to the mechanical angle of 360 degrees in FIG. 4 are distinguished from the rotor windings 330-1 to 330-16 in the rotational direction (counterclockwise direction).

  In FIG. 4, a space fourth-order magnetic flux is linked from the stator 100 to the inner rotor 300. The current phase of the induced electromotive force due to the magnetic flux becomes the same phase every mechanical angle of 90 °.

  In this embodiment, the rotor windings 330 in which the current phase of the induced electromotive force due to the asynchronous magnetic flux is in phase are connected in series and rectified by the rectifying element.

  As shown in FIG. 5, the rotor winding 330-1, the rotor winding 330-5, the rotor winding 330-9, the rotor winding 330-13, and the diode D1 are connected in series so that the current phase of the induced electromotive force is the same phase. Thus, a rectifier circuit C1 which is a closed circuit is formed.

  Similarly, the rotor winding 330-2, the rotor winding 330-6, the rotor winding 330-10, the rotor winding 330-14 and the diode D2 are connected in series to form a closed circuit rectifier circuit C2. .

  The rotor winding 330-3, the rotor winding 330-7, the rotor winding 330-11, the rotor winding 330-15, and the diode D3 are connected in series to form a closed circuit rectifier circuit C3.

  The rotor winding 330-4, the rotor winding 330-8, the rotor winding 330-12, the rotor winding 330-16, and the diode D4 are connected in series to form a closed circuit rectifier circuit C4.

  That is, the diodes D1, D2, D3, and D4 constitute a rectifying element in the present invention.

  By configuring in this way, the phase of the current ripple is different in each of the rectifier circuits C1, C2, C3, and C4, so that the torque ripple accompanying the induced current fluctuation can be smoothed.

  In addition, the number of diodes can be reduced compared to forming a closed circuit in which a diode is connected to each rotor winding 330, and a field current can be increased by suppressing a voltage drop due to the diode.

  Further, the rotating electrical machine 1 can be reduced in size and weight by reducing the number of diodes.

  Here, the principle of torque generation of the rotating electrical machine 1 will be described. In the inner rotor 300, among the magnetic fluxes linked from the stator 100 via the outer rotor 200, the magnetic flux modulated by the rotation of the outer rotor 200 is linked in synchronization with the rotation of the inner rotor 300.

  On the other hand, in the rotating electrical machine 1, the magnetic flux interlinking with the rotor winding 330 of the inner rotor 300 includes a component that fluctuates without being modulated by the outer rotor 200 (not synchronized with the rotation of the inner rotor 300). As a result, an AC induced current can be generated in the rotor winding 330. Then, the AC induced current is rectified by a diode to be a DC field current and the rotor winding 330 is energized, so that the rotor teeth 302 can function as an electromagnet to generate a field magnetic flux. In this way, the rotating electrical machine 1 can generate torque.

  At this time, the magnetic flux interlinking from the stator teeth 102 of the stator 100 to the rotor teeth 302 of the inner rotor 300 via the pole piece portion 201A of the outer rotor 200 is supplied from the AC power source to the concentrated armature coil 104. generate.

  By the way, this armature coil 104 employs concentrated winding in this embodiment, but may employ distributed winding.

  For these reasons, the rotating electrical machine 1 can relatively rotate the inner rotor 300 with electromagnet torque (rotational force) without providing a permanent magnet. In the inner rotor 300, the magnetic flux linked with the outer rotor 200 by causing the rotor teeth 302 to function as electromagnets that are arranged in parallel so that the magnetization directions (N pole and S pole) are alternated in the circumferential direction. Can be passed around the slot 303 smoothly.

  In this rotating electrical machine 1, the outer rotor 200 rotates relative to the stator 100, and the inner rotor 300 to which the magnetic flux passing through the rotating outer rotor 200 (magnetic path member 201) is linked is rotated relative to the electromagnet torque. Therefore, the inner rotor 300 can be rotated at a high speed while the outer rotor 200 is rotated at a low speed. Conversely, the outer rotor 200 can be rotated at a high speed and the inner rotor 300 can be rotated at a low speed.

  In addition, the rotating electrical machine 1 generates a torque necessary for the above-described rotational drive in accordance with the structure of the stator 100, the outer rotor 200, and the inner rotor 300. Specifically, the number of pole pairs of the armature coil 104 of the stator 100 is A, the number of pole piece parts 201A that is the number of poles of the outer rotor 200 is H, and the rotor teeth (electromagnet) 302 that is the number of pole pairs of the inner rotor 300 is When the number of pole pairs is P, the following formula (1) is established.

H = | A ± P | (1)
With this structure, it is possible to effectively generate torque and to efficiently rotate the outer rotor 200 and the inner rotor 300 relative to the stator 100. For example, in the rotating electrical machine 1 of the present embodiment, the number of pole pairs A = 4 of the armature coil 104 of the stator 100, the number of poles H = 12 of the outer rotor 200, and the number of pole pairs P = 8 of the rotor teeth 302 of the inner rotor 300. The above equation (1) is satisfied.

  As shown in FIG. 2, in the rotating electrical machine 1, an outer rotor 200 is rotatably accommodated in a stator 100, and an inner rotor 300 is rotatably accommodated in the outer rotor 200.

  Further, the outer rotor 200 is coupled to the outer rotor 200 so as to be integrally rotatable. An inner rotary shaft 310 is coupled to the inner rotor 300 so as to be integrally rotatable. Thereby, the rotary electric machine 1 is configured as a magnetic modulation type biaxial motor capable of transmitting power to each of the outer rotary shaft 210 and the inner rotary shaft 310 using the magnetic modulation principle.

  Therefore, the rotating electrical machine 1 can function, for example, the stator 100 as a sun gear of a planetary gear mechanism, the outer rotor 200 as a carrier of a planetary gear mechanism, and the inner rotor 300 as a ring gear of the planetary gear mechanism, and is equivalent to a mechanical planetary gear mechanism. A function can be provided. Note that the rotating electrical machine 1 according to the present embodiment is configured such that the outer rotor 200 functions as a carrier.

  With this structure, for example, when the rotating electrical machine 1 is mounted as a drive source together with an engine (internal combustion engine) in a hybrid vehicle, the outer rotating shaft 210 of the outer rotor 200 and the inner rotating shaft 310 of the inner rotor 300 are respectively connected to the power transmission path of the vehicle. By connecting directly to the armature coil 104 of the stator 100 via an inverter, it is possible to function as a power transmission mechanism together with the drive source.

  As described above, in the first embodiment described above, adjacent rotor teeth 302 in the circumferential direction of the inner rotor 300 are formed in a concentrated winding that is a circular winding in the opposite direction, and are arranged in the circumferential direction of the inner rotor 300. And the rectifier circuits C1, C2, C3, and C4 that are closed circuits in which diodes are connected in series.

  Thereby, since the phase of the current ripple is different in each of the rectifier circuits C1, C2, C3, and C4, it is possible to smooth the torque ripple accompanying the induced current fluctuation.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Here, since the second embodiment is configured in substantially the same manner as the first embodiment described above, the same components are denoted by the same reference numerals and the characteristic portions will be described.

  The rotor winding 330 in FIG. 6 includes an induction coil I and a field coil F. The induction coil I is wound around the outer rotor 200 side of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. The field coil F is wound around the axial center of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. That is, the induction coil I is wound on the radially outer side of the inner rotor 300 in the slot 303, and the field coil F is wound on the radially inner side of the inner rotor 300 in the slot 303.

  The induction coil I is formed in a concentrated winding in which the adjacent rotors in the circumferential direction of the inner rotor 300 form opposite windings for each rotor tooth 302 and are arranged in the circumferential direction of the inner rotor 300. The induction coil I generates (induces) an induced current by interlinking of magnetic flux.

  The field coils F are formed in such a way that adjacent windings in the circumferential direction of the inner rotor 300 are concentrated windings that form opposite circumferential windings for each rotor tooth 302, and are arranged in the circumferential direction of the inner rotor 300. The field coil F is excited by being supplied with a field current, and causes the rotor teeth 302 to function as an electromagnet.

  Thus, the induction coil I and the field coil F are wound so that the current directions are equal.

  Here, the eight induction coils I corresponding to the mechanical angle of 180 degrees in FIG. 6 are distinguished from each other by calling them induction coils I1 to I8 in the rotation direction (counterclockwise direction). In addition, eight field coils F corresponding to a mechanical angle of 180 degrees are distinguished from each other by being called field coils F1 to F8 in the rotation direction.

  In FIG. 7, induction coils I1, I3, I5, and I7 and field coils F1, F2, F3, and F4 together with diodes D5 and D6 form a rectifier circuit C5 that is a closed circuit.

  In this rectifier circuit C5, every third induction coil I1, I5 and diode D5 are connected in series, every third induction coil I3, I7 and diode D6 are connected in series, and field coils F1, F2, F3, F4. Are connected in series.

  In addition, the series connection (first series circuit) including the induction coils I1 and I5 and the diode D5 and the series connection (second series circuit) including the induction coils I3 and I7 and the diode D6 are connected in parallel at both ends. Later, on the cathode side of the diodes D5 and D6, they are connected in series connection consisting of field coils F1, F2, F3 and F4. As described above, the rectifier circuit C5 rectifies the AC induced current generated in the induction coils I1, I3, I5, and I7 in one direction by the diodes D5 and D6, respectively, and directs the current to the field coils F1, F2, F3, and F4. The circuit configuration is wired so as to supply the field current.

  The induction coils I2, I4, I6, I8 and the field coils F5, F6, F7, F8 together with the diodes D7, D8 form a rectifier circuit C6 that is a closed circuit.

  In this rectifier circuit C6, every third induction coil I2, I6 and diode D7 are connected in series, every third induction coil I4, I8 and diode D8 are connected in series, and field coils F5, F6, F7, F8. Are connected in series.

  In addition, the series connection (first series circuit) including the induction coils I2, I6 and the diode D7 and the series connection (second series circuit) including the induction coils I4, I8 and the diode D8 are connected in parallel at both ends. Thereafter, the cathodes of the diodes D7 and D8 are connected in series connection composed of field coils F5, F6, F7, and F8. In this way, the rectifier circuit C6 rectifies the AC induced current generated in the induction coils I2, I4, I6, and I8 in one direction by the diodes D7 and D8, respectively, and directs the current to the field coils F5, F6, F7, and F8. The circuit configuration is wired so as to supply the field current.

  That is, the diodes D5, D6, D7, and D8 constitute a rectifying element in the present invention.

  With this circuit configuration, the induction current generated by the induction coil I can be rectified and the field coil F can be excited as a field current, so that the rotor teeth 302 can function as an electromagnet.

  Here, the number of diodes D5, D6, D7, and D8 is suppressed by connecting them in series even when the induction coil I and the field coil F are multipolarized. Rather than forming an H-bridge type full-wave rectifier circuit, the neutral-point-clamped half-wave rectifier outputs a half-wave rectified output by inverting one of the induction currents so that each phase is 180 degrees. A circuit is formed.

  In the field coils F of the rectifier circuits C5 and C6, the winding directions of the adjacent rotor teeth 302 are reversed. Accordingly, one rotor tooth 302 of the inner rotor 300 that constitutes a part of the magnetic circuit is magnetized so as to function as an electromagnet that faces the south pole that is directed from the pole piece portion 201A of the outer rotor 200. . Further, another adjacent rotor tooth 302 is magnetized so as to function as an electromagnet that faces the N pole in a direction in which magnetic flux is guided to the outer rotor 200 side.

  Here, the principle of torque generation of the rotating electrical machine 1 will be described. In the inner rotor 300, among the magnetic fluxes linked from the stator 100 via the outer rotor 200, the magnetic flux modulated by the rotation of the outer rotor 200 is linked in synchronization with the rotation of the inner rotor 300.

  On the other hand, in the rotating electrical machine 1, the magnetic flux interlinked with the induction coil I of the inner rotor 300 includes a component that varies without being modulated by the outer rotor 200 (not synchronized with the rotation of the inner rotor 300). As a result, an alternating induction current can be generated in the induction coil I. The AC induced current is rectified by the diodes D5 and D6 to be a DC field current, and the field coil F is energized to cause the rotor teeth 302 to function as an electromagnet to generate a field magnetic flux. it can. In this way, the rotating electrical machine 1 can generate torque.

  At this time, the magnetic flux interlinking from the stator teeth 102 of the stator 100 to the rotor teeth 302 of the inner rotor 300 via the pole piece portion 201A of the outer rotor 200 is supplied from the AC power source to the concentrated armature coil 104. generate.

  FIG. 8 shows a magnetic circuit of asynchronous magnetic flux interlinking with the inner rotor 300. As shown in FIG. 8, since the magnetic flux is uniformly linked to the rotor teeth 302 of the inner rotor 300, an induced electromotive force is also generated in the field coil F. However, when the induced electromotive force of the field coil F is used, it interferes with the induced electromotive force of the induction coil I, and the phases of the induction coils I (the first series circuit and the second series circuit) connected in parallel are parallel. The relationship breaks down. As a result, full-wave rectification cannot be performed, and the torque ripple accompanying the induced current fluctuation becomes large.

  Therefore, in order not to interfere with the induced electromotive force of the induction coil I, connection is made so as to cancel the induced electromotive force of the field coil F. That is, in the second embodiment, field coils F within a mechanical angle of 90 ° are connected in series.

  With such a connection, the current flowing through the field coil F can be full-wave rectified while maintaining the phase relationship of the induction coils I (the first series circuit and the second series circuit) connected in parallel. it can.

  In addition, as in the first embodiment, the induced current is full-wave rectified as compared with the case where only the rotor winding 330 in which the phase of the induced electromotive force is in phase is connected in series and connected to a diode. Ripple can be greatly reduced.

  In addition, the full-wave rectification reduces the rotor current amplitude, so that a diode with a low allowable current value can be selected, and the cost can be reduced and the parts can be reduced in weight.

  Furthermore, by connecting so that the induced electromotive force of the field coil F is canceled, the differential frequency (the differential frequency between the stator rotating magnetic field and the rotor rotational speed) is increased while securing the magnetomotive force due to the field current. However, the voltage drop in the self-inductance is not excessively increased, and the torque characteristics can be improved.

  As described above, in the second embodiment described above, adjacent rotor teeth 302 in the circumferential direction of the inner rotor 300 are formed into concentrated windings that are circular windings in opposite directions, and are arranged in the circumferential direction of the inner rotor 300. Field coils arranged in the circumferential direction of the inner rotor 300 are formed so that the adjacent coils in the circumferential direction of the inner rotor 300 are concentrated windings that are reverse windings for each of the induction coils I and the rotor teeth 302. A coil F, and a plurality of induction coils I having in-phase current phases and rectifier circuits C5 and C6 having a first series circuit and a second series circuit in which diodes are connected in series.

  Thereby, since the phase of the current ripple is different in each of the first series circuit and the second series circuit of the rectifier circuits C5 and C6, it is possible to smooth the torque ripple accompanying the induced current fluctuation.

  The rectifier circuits C5 and C6 include a first series circuit in which a plurality of induction coils I and diodes having the same phase of the induced current are connected in series, and a current phase of the induced current opposite to that of the first series circuit. A plurality of phase induction coils I and a second series circuit in which diodes are connected in series, and the first series circuit and the second series circuit are connected in parallel.

  Thereby, since the induced current is full-wave rectified, torque ripple can be significantly reduced.

  The rectifier circuits C5 and C6 are connected in series with the parallel circuit of the first series circuit and the second series circuit to connect the plurality of field coils F so as to cancel the induced electromotive forces of the field coils F. Circuit.

  As a result, the current flowing through the field coil F can be full-wave rectified while maintaining the phase relationship between the first series circuit and the second series circuit connected in parallel, and torque ripple can be greatly reduced. it can.

  Although the rotary electric machine 1 of 1st and 2nd embodiment is an inner rotor type of a radial gap structure, an axial gap structure or an outer rotor structure may be sufficient. Further, the pole combination has been described in the case where the stator 100 has a 4-pole pair, the outer rotor 200 has a 12-pole pair, and the inner rotor 300 has an 8-pole pair. However, different pole combinations may have the same configuration.

  Moreover, a copper wire, an aluminum conductor, and a litz wire can be used for each coil. Further, as the magnetic path member 201 and the rotor core 301, an SMC (Soft Magnetic Composite) core, which is a soft magnetic composite material, can be used instead of the laminated electromagnetic steel sheet.

  Further, the magnetic modulator formed of the magnetic path member 201 and the nonmagnetic member 202 may be used as the inner rotor, and the rotor winding 330 or the field rotor including the field coil F and the induction coil I may be used as the outer rotor.

  Further, the present invention can be similarly applied to a rotating electrical machine that does not have a magnetic modulator and generates an induced electromotive force in a rotor winding by interlinkage magnetic flux due to the spatial harmonics of the stator.

  The rotating electrical machine 1 can be applied not only to hybrid vehicles but also to other industrial fields such as wind power generators and machine tools.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 100 Stator 104 Armature coil 200 Outer rotor (2nd rotor)
201 Magnetic path member 202 Non-magnetic member 300 Inner rotor (rotor, first rotor)
302 rotor teeth (saliency pole)
330-1-16 Rotor winding C1, C2, C3, C4, C5, C6 Rectifier circuit D1, D2, D3, D4, D5, D6, D7, D8 Diode (rectifier element)
F1, F2, F3, F4, F5, F6, F7, F8 Field coils I1, I2, I3, I4, I5, I6, I7, I8 Inductive coils

Claims (4)

A stator having an armature coil that generates magnetic flux when energized;
A rotating electrical machine comprising a rotor that rotates by passage of the magnetic flux,
The stator has the armature coil formed by concentrated winding,
The rotor includes a plurality of salient pole parts arranged in parallel in a circumferential direction around which a rotor winding for inducing an induced current by interlinking of magnetic flux generated in the armature coil, and rectifies the induced current into a direct current A rectifier circuit that
The rotor winding is wound so that the polarity of the magnetic poles of the adjacent salient pole portions is different,
The rectifier circuit includes a plurality of rotor windings wound around the salient pole portions having the same polarity of the magnetic poles, and a plurality of rotor windings having the same phase of the induction current and a rectifying element are connected in series. rotating electric machine closed circuit that provided a plurality for each polarity of the magnetic pole to be connected to. A stator having an armature coil that generates magnetic flux when energized;
A first rotor that rotates by passage of the magnetic flux;
A rotating electric machine comprising: a second rotor arranged and rotated in the middle of the magnetic path of the magnetic flux passing through the first rotor,
The stator has the armature coil formed by concentrated winding,
The second rotor has a plurality of soft magnetic bodies arranged so as to maintain a predetermined interval in the circumferential direction,
The first rotor is arranged in parallel in a circumferential direction in which an induction coil that induces an induced current by linkage of magnetic flux generated in the armature coil and a field coil that generates a magnetic field by energizing the induced current are wound. A plurality of salient pole parts, and a rectifier circuit that rectifies the induced current into a direct current,
The induction coil is wound so that the polarities of the magnetic poles of the adjacent salient pole portions are different,
The field coil is wound so that the magnetic poles of the salient pole portions adjacent to each other have different polarities.
In the rectifier circuit, a plurality of the induction coils having the same phase of the induction current and a rectifier element are connected in series among the plurality of induction coils wound around the salient pole part having the same polarity of the magnetic pole. A rotating electrical machine in which a plurality of closed circuits are provided for each polarity of the magnetic poles of the induction coil .   The rectifier circuit includes: a first series circuit in which a plurality of the induction coils having the same phase of the induced current and the rectifier element are connected in series; and a current phase of the induced current is the first series circuit. Has a second series circuit in which a plurality of the induction coils having opposite phases and the rectifying element are connected in series, and the first series circuit and the second series circuit are connected in parallel. Item 3. The rotating electrical machine according to Item 2.   The rectifier circuit is a closed circuit that connects a plurality of the field coils in series with the parallel circuit of the first series circuit and the second series circuit so as to cancel the induced electromotive forces of the field coils. The rotating electrical machine according to claim 3.